EP1912783A1 - Procédé de fabrication d'une pièce comprenant une couche de mousse supportée par un support - Google Patents
Procédé de fabrication d'une pièce comprenant une couche de mousse supportée par un supportInfo
- Publication number
- EP1912783A1 EP1912783A1 EP06794243A EP06794243A EP1912783A1 EP 1912783 A1 EP1912783 A1 EP 1912783A1 EP 06794243 A EP06794243 A EP 06794243A EP 06794243 A EP06794243 A EP 06794243A EP 1912783 A1 EP1912783 A1 EP 1912783A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- foam
- foam layer
- mold
- support
- complex
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/04—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities
- B29C44/0461—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities by having different chemical compositions in different places, e.g. having different concentrations of foaming agent, feeding one composition after the other
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/065—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
- B29C44/1285—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements the preformed part being foamed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/56—After-treatment of articles, e.g. for altering the shape
- B29C44/5627—After-treatment of articles, e.g. for altering the shape by mechanical deformation, e.g. crushing, embossing, stretching
- B29C44/5636—After-treatment of articles, e.g. for altering the shape by mechanical deformation, e.g. crushing, embossing, stretching with the addition of heat
- B29C44/5645—Differential deformation by differential heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/58—Moulds
- B29C44/586—Moulds with a cavity increasing in size during foaming
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14778—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the article consisting of a material with particular properties, e.g. porous, brittle
- B29C45/14795—Porous or permeable material, e.g. foam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
- B29C45/561—Injection-compression moulding
- B29C2045/563—Enlarging the mould cavity during injection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/10—Polymers of propylene
- B29K2023/12—PP, i.e. polypropylene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
- B29K2027/06—PVC, i.e. polyvinylchloride
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2266/00—Composition of foam
- B32B2266/02—Organic
- B32B2266/0214—Materials belonging to B32B27/00
- B32B2266/0221—Vinyl resin
- B32B2266/0235—Vinyl halide, e.g. PVC, PVDC, PVF, PVDF
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2266/00—Composition of foam
- B32B2266/02—Organic
- B32B2266/0214—Materials belonging to B32B27/00
- B32B2266/025—Polyolefin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2605/00—Vehicles
- B32B2605/003—Interior finishings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24355—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
- Y10T428/249961—With gradual property change within a component
Definitions
- the present invention relates to a method of manufacturing a part comprising a layer of thermoplastic foam material supported by a support, as well as the part obtained.
- such a part generally comprises an additional layer on the face of the foam opposite that which is at contact of the support, this additional layer having elastomeric properties.
- the foam layer is intended to give damping properties which depend on the flexibility of the foam layer, and thus on various properties such as its porosity.
- JP 06320571, JP 10235676 and JP 06328481 already disclose processes of a first type intended for the production of parts comprising a layer of foam of thermoplastic material supported by a support, the process comprising the provision of a sheet of a thermoplastic foam layer precursor on a surface of a mold portion (10, 30), while the mold is open, closing the mold to define a cavity between the foam layer precursor and another mold part, and the injection in the cavity of a non-cellular plastics material for forming the support, which is hot enough to cause foaming from the precursor, with gradual separation of the two mold parts in a direction having a component in the direction of the thickness of the precursor.
- a foam layer or a skin-foam complex is produced at a first station, then the foam layer or the complex is placed on a first mold part, the mold is closed, and the plastic material intended to form the support is injected into a cavity left between the foam layer or the complex and the other mold part.
- This method has a disadvantage because the non-cellular plastic material of the support is injected against the foam layer or the complex which is therefore subjected to the injection pressure of the plastic material of the support.
- the foam layer or the complex still has some crushing. It is not uncommon for the thickness of the foam to be halved. It is conceivable that the foam layer finally obtained has softening properties and damping properties that would be obtained without applying the injection pressure of the support.
- the object of the invention is to overcome the drawback of the aforementioned method of the second type, by combining therewith characteristics of the process of the first type.
- This combination of known means gives an unexpected result, different from the results obtained by each of the two aforementioned methods.
- the foam layer can have substantially constant properties throughout its thickness.
- this face tends to undergo a greater heating and to create a porosity gradient such that the Porosity is the lowest on the support side.
- an additional step of separating the two mold parts is added during or, preferably, after injection of the non-cellular plastic material of the support.
- a foam layer or a complex can regain volume by substantially or essentially mechanical expansion, and possibly by partially chemical. It is found that the process gives pieces which have a porosity which is the largest on the support side.
- the invention relates to a method of manufacturing a part comprising a layer of thermoplastic foam supported by a support, of the type which comprises the arrangement of a thermoplastic foam layer complex on a surface of a mold part, while the mold is open, closing the mold so that it delimits a cavity between the foam layer complex and another mold part, and injecting into the cavity a non-plastic material cell to form the support.
- the method comprises, after the end of the injection of the plastic material intended to form the support, a step of progressive separation at a predetermined speed of the two mold parts, in a direction having a component in the direction of the thickness of the foam layer complex, with preservation of the sealing of the molding cavity.
- the foam layer complex is a single layer of foam that undergoes only substantially physical changes during the step of spacing.
- the foam layer complex comprises a non - cellular surface layer and a foam layer that undergoes substantially only physical changes during the step of spacing.
- the step of progressive separation is carried out over a distance such that, in the finished part, the layer of foam has a thickness of between 0.5 and 1.5 times the thickness of the foam in the state free before closing the mold, and advantageously such that, in the finished part, the foam layer has a thickness that does not differ by more than 10% of the thickness of the foam in the free state before the closure of the mold .
- the method comprises, before the closure of the mold, the preheating of the foam layer complex.
- the method further comprises a waiting step between the end of the step of injecting the non-cellular plastic material and the step of progressive separation.
- the step of progressively spacing the two mold parts is carried out at a speed of between 0.1 and 10 mm / s.
- the injection temperature of the non-cellular plastic material for forming the support is set higher than the temperature of the foam layer complex in the mold, so that the foam layer of the complex has a gradient during the process and exhibits an essentially mechanical expansion which has a gradient and is greater near the injected plastic material.
- the foam layer of the foam layer complex contains a residual amount of pore-forming material.
- the invention also relates to a damping piece made by a method according to the invention, having a foam layer complex disposed on a substantially rigid support, and such that the foam layer of the complex is a flexible thermoplastic layer, which has has undergone essentially mechanical expansion, and has a porosity gradient between the face adjacent to the support and the opposite face, and the gradient is such that the porosity decreases from the face adjacent to the support to the opposite face.
- the variation in porosity corresponds to a variation of the pore size.
- thermoplastic material of the foam is chosen from polyolefins and polyvinyl chloride, especially polyethylene.
- the thermoplastic foam layer has a thickness of less than 23 mm.
- the foam further comprises a surface layer, on the opposite side of the support, and the surface layer advantageously has elastomeric properties.
- the surface layer has a grain.
- the non-cellular plastic material of the support and the thermoplastic material of the foam layer are of the same chemical nature.
- FIG. 1 is a schematic section illustrating a process step in which a mold is closed but a non-cellular plastic material has not yet been injected
- Figure 2 is a schematic section corresponding to Figure 1, but in which a non-cellular plastic material for forming the support has been injected
- FIG. 3 illustrates the next step of the process in which the two mold parts have been discarded, in a step causing a characteristic change in the physical properties of the foam layer, according to the invention
- Figure 4 illustrates the preheating of a complex used in a process in which a surface layer is grained according to the invention
- Figure 5 is a schematic section illustrating a step in which a non-cellular plastic material begins to be injected into the closed mold
- Fig. 6 illustrates the next step of the method wherein the two mold parts are spaced apart, causing a characteristic change in the physical properties of the foam layer according to the invention.
- FIGS 1 to 3 are very schematic views illustrating the principle of the method according to the invention, in very exaggerated form, in the case where the foam layer complex is a single layer of foam.
- the mold used essentially comprises a matrix 10 having a cavity 12, and a punch 14 having an injection channel 16. There is shown a layer 18 of foam with its normal expanded form.
- the state shown in FIG. 1 is obtained by separating the two mold parts 10, 14, by placing the foam 18, then by introducing the punch 14 in the marked position inside the matrix 10.
- FIG. 2 illustrates the step of injecting the non-cellular plastic material intended to form a support 20.
- the injected plastic material exerts a pressure which reduces the thickness of the foam 18.
- the injection has just been interrupted, and the foam 18 has been compressed by the injection of the non-cellular material so that its thickness has greatly decreased.
- Figure 3 illustrates the essential step of the method of the invention.
- the porosity of the foam 18, and therefore its damping properties, have been reduced in the step of FIG. 2, with respect to the foam introduced into the cavity of the matrix 10.
- the matrix 10 is separated from the punch 14 (or conversely) by a distance marked with reference 22, preferably when the injection of the non-cellular material is complete, and that this material has passed to an at least partially solidified state.
- This spacing causes an increase in thickness of the foam layer 18 in the spacing direction, that is to say horizontally in FIG. 3.
- the spacing distance is selected so that the The foam layer has a final thickness of between 0.5 and 1.5 times its initial thickness, and preferably between 0.9 times and 1 times its initial thickness, as shown in FIG.
- the injected material When the non-cellular plastic material is introduced for the formation of the support 20, the injected material is hot and transfers heat to the foam 18, preferably in proximity to the injected material. It creates a temperature gradient in the foam. Accordingly, as the foam expands due to the spacing of the two mold portions shown in FIG. 3, the hottest foam portion tends to exhibit greater expansion than the less hot portion. As a result, the foam portion closest to the support 20 exhibits greater expansion and thus greater porosity than the remote foam portion of this support. These modifications during the spacing step are essentially physical (variation of porosity).
- the part closest to the plastic of the support 20 has undergone the greatest heating and, as it does not have the opportunity to expand later, it has the largest compression and thus the largest reduction in porosity. Accordingly, in the molded part obtained after the step of FIG. 2, the porosity gradient of the foam layer 18 is such that the porosity increases from the support to the opposite surface to the support. On the contrary, during the implementation of the method of the invention, this effect is at least compensated and, more often than not, compensated, that is to say, inverted, so that the part obtained has a porosity gradient such that the porosity is greatest near the support 20.
- the foam layer 18 has returned to a thickness similar to that which it originally had, its damping properties are similar. It is therefore not necessary to empirically determine, for each piece shape, which type of foam to use initially to achieve the desired end properties. According to the invention, the final properties obtained with the foam layer are substantially those which can be expected from the use of the initial foam.
- Figures 4 to 6 are very schematic views of steps of the method of the invention the foam layer complex is a complex skin-foam layer.
- Figure 4 shows the constitution of a layer 24 of a complex formed of a dense layer 26 of surface, for example a polyolefin skin, and a layer 28 of a layer of foam, for example polypropylene.
- the layer of the complex Before introduction into the injection mold of the support, the layer of the complex is preheated. The temperature can be sufficient so that, as soon as the mold has been closed and before injection of the support, the application of vacuum between the dense layer 26 and the adjacent mold surface causes a graining of the surface of the dense layer.
- FIG. 5 represents the arrangement of the various elements when the complex layer has been placed in the mold 30, 31, 32, the latter has been closed to define a cavity 34 for molding the support, and the injection of the plastic material. 36 of the media has started.
- the foam layer 28 has been compressed.
- the plastic material of the substrate that is injected has a temperature greater than that of the foam layer, the latter is heated and reaches a temperature facilitating changes in physical properties.
- foam then has an expansion space. Since the heat comes from the injected material, the amount of heat received by the foam is greater near that material, and the foam tends to take greater porosity near the support.
- the recoil distance of the piston 32 in the mold portion 31 may be any desired value for obtaining the desired thickness of the foam layer.
- the foam used is formed of a thermoplastic material, so that it can have the necessary expansion or expansion in the spacer phase. It may be polyvinyl chloride, a polyolefin, and in particular polypropylene or polyethylene, which are well suited to this kind of process. It is furthermore advantageous if the plastics material of the support is of a chemical nature compatible with that of the foam, and, in an ideal case, is made of the same plastic material.
- the spacing distance marked by the reference 22 corresponds to the thickness of the foam or to the thickness recovery that it is desired to give to the foam.
- Other parameters of the process of the invention are the moment at which the step of separating the two mold parts begins, and the speed of separation.
- the spacing step begins only after the end of the injection of the plastic material of the support.
- the plastic material of the support could be introduced in excessive quantity.
- the foam in order for the foam to fill the space created by the step of separating the two mold parts, it may be desirable to use a portion of die having suction channels, so that the foam remains well. pressed against the surface of the cavity of the die portion, so that the dense surface layer of the complex is grained against the surface of the mold.
- foam layer complex refers to either a single layer of foam that exhibits changes in its physical properties during the process, or a complex comprising a foam layer and a surface layer.
- the advantage of the porosity gradient foam layer obtained by the process according to the invention is that it is firmer in the vicinity of the outer surface than on the side of the support. It is then possible to obtain, even without a layer of a specific dense material, a layer of foam whose surface is continuous, thanks to its contact with the mold surface, but which gives a reaction to the touch similar to that which gives a skin on a homogeneous foam.
- the temperature gradient, and thus the porosity gradient obtained increases as the coefficient of thermal conductivity of the foam is small.
- the use of a complex to foam layer gives a behavior different from that of a dense material, for example a dense solid or liquid layer which transmits heat better than a cellular material of the same chemical substance.
- porosity gradient obtained is insufficient, for example because the nature of the materials of the foam and the support requires an insufficient temperature difference between the foam and the injected material, it is possible to use a complex whose layer of foam has not undergone complete foaming, that is to say still contains a porogenic material.
- the porosity gradient obtained by substantially purely physical modifications of the foam is then supplemented by a porosity gradient obtained by chemical means. These two gradients reinforce each other.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0508153A FR2889100B1 (fr) | 2005-07-29 | 2005-07-29 | Procede de fabrication d'une piece comprenant une couche de mousse supportee par un support |
FR0602219A FR2889101B1 (fr) | 2005-07-29 | 2006-03-14 | Procede de fabrication d'une piece comprenant une couche de mousse supportee par un support |
PCT/FR2006/001849 WO2007012769A1 (fr) | 2005-07-29 | 2006-07-28 | Procédé de fabrication d'une pièce comprenant une couche de mousse supportée par un support |
Publications (1)
Publication Number | Publication Date |
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EP1912783A1 true EP1912783A1 (fr) | 2008-04-23 |
Family
ID=37232880
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP06794243A Withdrawn EP1912783A1 (fr) | 2005-07-29 | 2006-07-28 | Procédé de fabrication d'une pièce comprenant une couche de mousse supportée par un support |
Country Status (4)
Country | Link |
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US (1) | US9044890B2 (fr) |
EP (1) | EP1912783A1 (fr) |
FR (1) | FR2889101B1 (fr) |
WO (1) | WO2007012769A1 (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE112008000317T5 (de) * | 2007-01-30 | 2010-03-11 | Sumitomo Chemical Co., Ltd. | Verfahren zur Herstellung von thermoplastischen Harzformkörpern |
DE102012023608B4 (de) * | 2012-12-04 | 2015-03-12 | Hennecke Gmbh | Verfahren und Vorrichtung zum Herstellen eines Formteils |
US20160016342A1 (en) * | 2013-03-15 | 2016-01-21 | Basf Se | Method Of Overmolding A Polymeric Material Onto A Microcellular Polyurethane And An Article Made Therefrom |
EP2910357A1 (fr) * | 2014-02-20 | 2015-08-26 | Basf Se | Procédé de fabrication d'un élément composite |
DE102016004311B4 (de) * | 2016-04-12 | 2018-03-15 | Dräger Safety AG & Co. KGaA | Verfahren zum Herstellen einer Polstervorrichtung für ein Tragegurtsystem für ein Atemgerät, Polstervorrichtung, Tragegurtsystem und Atemgerät |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5281376A (en) * | 1990-10-12 | 1994-01-25 | Sumitomo Chemical Company, Limited | Method for producing polypropylene resin article having skin material lined with foamed layer |
JPH0788878A (ja) * | 1993-09-20 | 1995-04-04 | Kobe Steel Ltd | 発泡射出成形方法 |
JPH10235676A (ja) * | 1997-02-24 | 1998-09-08 | Idemitsu Petrochem Co Ltd | 表皮材付き樹脂成形品の製造方法 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0611500B2 (ja) * | 1986-06-17 | 1994-02-16 | 住友化学工業株式会社 | 熱可塑性樹脂のプレス成形方法 |
JP3340186B2 (ja) * | 1993-05-17 | 2002-11-05 | 積水化学工業株式会社 | 積層成形体の製造方法 |
JP2935447B2 (ja) * | 1993-05-24 | 1999-08-16 | 河西工業株式会社 | 自動車用内装部品の製造方法 |
DE4342729C2 (de) * | 1993-12-15 | 1995-10-26 | Moeller Werke Gmbh | Verfahren zum Herstellen von Kunststofformteilen mit Kaschierung aus Dekormaterial |
EP1435285A4 (fr) * | 2001-10-10 | 2006-03-15 | Sakaeriken Kogyo Co Ltd | Procede de production de moulages en plastique avec motifs textures |
-
2006
- 2006-03-14 FR FR0602219A patent/FR2889101B1/fr not_active Expired - Fee Related
- 2006-07-28 US US12/065,344 patent/US9044890B2/en not_active Expired - Fee Related
- 2006-07-28 WO PCT/FR2006/001849 patent/WO2007012769A1/fr active Application Filing
- 2006-07-28 EP EP06794243A patent/EP1912783A1/fr not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5281376A (en) * | 1990-10-12 | 1994-01-25 | Sumitomo Chemical Company, Limited | Method for producing polypropylene resin article having skin material lined with foamed layer |
JPH0788878A (ja) * | 1993-09-20 | 1995-04-04 | Kobe Steel Ltd | 発泡射出成形方法 |
JPH10235676A (ja) * | 1997-02-24 | 1998-09-08 | Idemitsu Petrochem Co Ltd | 表皮材付き樹脂成形品の製造方法 |
Non-Patent Citations (1)
Title |
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See also references of WO2007012769A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2007012769A1 (fr) | 2007-02-01 |
FR2889101B1 (fr) | 2010-07-30 |
US9044890B2 (en) | 2015-06-02 |
US20090148663A1 (en) | 2009-06-11 |
FR2889101A1 (fr) | 2007-02-02 |
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